Oil burner



A. R. HOEFT 1,948,857

Feb. 27, 1934.

OIL BURNER 2 Sheets-Sheet 1 Filed Nov. 26, 1950 I I Jim/6mm Aim #26 Feb. 27, 1934. A. R. HOEFT 1,948,357

OIL BURNER Filed Nov. 26, 1930 2 Sheets-Sheet 2 M J 1 Z 7 {Z6 ITUIQTJIJP. i 2524 \1 =Adagazizzeff /9 i 5 5 1 R 3 wily/5 is; Z /5 x Patented Feb. 27, 1934 UNITED STATES OIL BURNER Adolph R. Hoeft, Evanston, 111., assignor to Hoeft & Company, Inc., Chicago, 111., a corporation of Illinois Application November 26, 1930 Serial No. 498,259

3 Claims. (Cl. 158-91) This invention relates to improvements in oil burners and it consists of the matters hereinafter described and more particularly pointed out in the appended claims.

The invention is of particular advantage in gravity fed, natural draft oil burners and one of the objects of the invention is to so arrange those parts thereof forming the air inlets, so as to insure a complete surrounding of the oil inlet with air necessary to support combustion whereby an even and clean burning flame results.

Another object of the invention is to provide a burner of this kind which may be made at a relatively low cost which may be easily assembled .18 and has its various'parts so disposed as to make the burner more readily oleanable.

These objects of the invention as well as others together with the many advantages thereof will more fully appear as I proceed with my speciflcation.

In the drawings:-

Fig. 1 is a vertical sectional perspective view of an oil burner embodying the preferredform of my invention.

Fig. 2 is a horizontal sectional view through the same as taken on the line 2-2.of Fig. 1, with parts of the burner ring and flame baflle or spreader broken away to better illustrate the invention.

Fig. 3 is a vertical detail sectional view through the burner plate and associated parts, in the plane of a pair of oppositely disposed air'inlet ducts, the plane of the section being indicated by the line 33 of Fig. 2. a

Fig. 4 is another vertical detail sectional view through the burner plate and associatedparts as taken on the line 4-4 of Fig. 2.

Fig. 5 is a perspective view of a certain burner ring embodied in my invention.

In general my improved burner includes a circular burner plate, supported upon suitable legs and having mounted thereon a casing like drum including an annular chamber surrounding the drum, the chamber and drum being closed by a top plate. In the top plate is a lid and a stack opening for the chamber, the latter being diametrically opposite an opening between said drum and chamber.

The burner plate is provided at its center with an oil feed about which is an annular oil retaining groove and opening radially about the same is a plurality of air inlet ducts, each having a top inlet outside the drum.

Disposed above the oil feed is a burner ring that 65; supports a fire pot with a spider like battle at its,

top end. As the flames leave the burner ring, they impinge against the bafile to be deflected radially of the pot and thereafter pass upwardly through the spider into the casing like drum.

Referring now in detail to that embodiment of M the invention illustrated in the drawings :1 indicates as a whole a circular burner plate preferably'made as an integral casting and including a horizontal bottom wall 2 with an upright peripheral flange 3 thereabout. outwardly beyond this 68 flange said burner plate is formed to provide an annular shoulder '4. The central portion 5 of said bottom wall is made thicker than the remainder thereof and in the top surface 6 of said central portion 5 is an annular groove 7 surrounded by 70.: an annular flanges, concentric with the axis of said plate. In said axis of the plate is an inlet opening 9 into which is screwed the end of an oil supply pipe 10. Surrounding the flang'e'8 is an annular overflow groove 11 the floor of which is 75.- located in a plane below that of the top surface or the wall 2 of the burner plate.

Seated on but spaced above the surface 6 is an oil spreading disc 12 ha g an apertured top flange 12 and a guide stem 12 disposed in the 841 inlet 9 in a mannerpermitting oil to flow from said inlet onto the surface 6 and into the groove 7. 1

Excess fuel that spills over the flange 8 enters the groove 11 and such excess as accumulates in 85. this last mentioned groove, flows out a pipe 13 that opens into said groove from the bottom. Of course; this pipe leads to a suitable container (not shown) so that overflow fuel may be again used.

The burner plate 1 is provided with sets of radially disposed, upright flanges 14-14 and as shown herein there are four sets of such flanges, spaced apart. The said flanges of each'set' are extended outwardly beyond the peripheral 05. flange 3 of the burner plate and are connected bya curved end wall 14 and are closed at the bottom by a wall portion 2 that forms a part of said bottom wall 2 0i the burner plate. Said upright radial flanges terminate at their inner 10o ends at the overflow groove 11 and one flange of one set is there connected to the nearest like flange of an adjacent set by an upright flange 15 concentric with the peripheral flange 3. Between the upright radial flanges of each set of said flanges, in the circle of the peripheral flange 3 is an upright flange 16 of a height less than that of said radial flanges'3. i

In those radial planes, midway between the flanges 14 of adjacent sets of said flanges, the

flange 3 is increased in height to form ears 1'! the purpose of which will presently appear and in each of said planes, there is secured to the bottom surface of the burner plate, a supporting leg 18. Said leg includes a' horizontal top portion 19 which is bolted to the burner plate as at 20.

Supported upon the inner end 'of the radial flanges 14 of all of said sets thereof is a burner ring 21 having a central opening 22 defined on the top surface of the ring by an annular flange 23. 'On the bottom of said ring are depending flanges 24 of such arcuate length as to fit between the inner end of the flanges 14 outsideof the arcuate flanges 15 as best shown in Fig. 4. On the top surface of said ring, near its periphery is formed an annular groove 25.

Seated in said groove of the burner ring is an annular fire pot member 26 of suitable height having an inturned flange 2'7 at its top end. Associated with said pot flange is a baffle including a centrally disposed, upwardly concaved baflle portion 28 and a plurality of radially extending spider arms 29 that engage at their ends upon the pot flange for support. On the top surface of the baffle portion 28 is an apertured ear 30, the purpose of which will soon appear.

31 indicates an upright tubular casing like drum of suitable height and of a diameter approximating that of the outside of the annular peripheral flange 3 of the burner so that its bottom edge will engage snugly upon the annular shoulder 4 on said burner plate. This drum is cut away to straddle the flanges 14 of each set thereof and stove bolts 32 pass through the bottom portion of said drum and through the ears 1'? to secure said casing to the burner plate.

Associated with each setv of flanges 14 and engaged upon those portions thereof between the drum 31 and burner ring 21 is a cover plate 33 and depending from said cover plate is a transverse flange 34. The outer end of said cover plate is thickened to provide a. flange 35 adapted to give a better, engagement betweenthe drum and cover plate at this point, and the inner end 36' of each plate extends under the burner ring as best shown. in Fig. 3. Each cover plate and its associated set of flanges 14 thus provide a closed conduit or air passage 37 within the drum and which has an open top inlet end 38 without the drum and a somewhat more restricted discharge end that opens against the side of, the annular flange 7 beneath the burner ring. By reason of the arcuate flanges on the burner plate between each set of radial. flanges 1-4 and by reason of the depending flange on each associated cover plate, the air entering said conduit must travel in a somewhat tortuous path and the products of combustion cannot at any time flash back or backfire out of any of the air inlets with probable resulting damage to adjacent objects.

Surrounding the top end of the, drum is an annular chamber providing casing 39 and both said casing and drum are closed by a top plate 40. An opening 41 in one side of the drum at the top affords communication between said drum and chamber and diametrically opposite this opening the top. plate. has a flange 42 to. receive a pipe or stack 43' whereby the waste products of combustion pass. to a suitable point of discharge.

In the top plate isv a removable lid 44 on the order of the ordinary stove lid.

By removing said lid, and inserting a suitable long handled hook into the casing, and engaging the same with the apertured' ear ofthe bafile, the

1 same may be removed up through the top plate,

thus exposing the burner ring 21 and disc 12 therebeneath. Should their condition be such that a cleaning thereof is deemed desirable, the same hook may be used to remove the burner ring and then the disc. After cleaning, the parts are restored and the burner is ready for further use.

When the burner is in operation, the air entering the air inlets 38 passes through the various conduits 37 to be discharged against the periphery ofthe flange 8 to provide that air necessary to support combustion of the fuel with a bright clean flame. Of course, when the burner is first startedand the air in the drum is at a substantially low temperature, combustion will be rather sluggish because of the slow movement of air through said conduit. However, so soon as the temperature in the drum rises, mixed air and products of combustion pass up the pipe 43 and this causes a natural and increased draft through said conduits 3'7 to provide that air required to support proper combustion of fuel therein. .As the flames pass through the burner ring, they impinge the beforementioned spider and are deflected laterally and downwardly into the pot, to pass then upwardly between the various arms of the said spider into the drum.

The, burner is of simple construction and may be easily inspected and cleaned and is indeed safe in use. In this respect, it is pointed out that no liquid fuel can flood from the overflow groove into the respective air conduits and there can be no flash backs or back-firing through said conduits to pass out the inlets 38 thereof because of the bafiling action of the flanges 16 on the burner plate and the flanges 34' on the cover plate 33.

While in describing my invention, I have referred in detail to the form, construction and arrangement of the various parts, the same is to be considered merely as illustrative, so that I do not wish to be limited thereto except as may be specifically set forth in the appended claims.

I claim as my invention: g

1. In an oil burner, a burner plate, a drum supported thereon, means providing a fuel feed centrally of said plate, aplurality of sets of radially disposed flanges extending froma point adjacent said feed to a point outside the drum, the flanges of one set being connected at their inner ends to those of adjacent sets to provide a. chamber about said feed, a burner ring supported upon the inner ends of said sets of flanges in operative relation with respect to said feed and forming a top for said chamber, a cover plate removably engaged upon each set of flanges between said drum and burner ring and coacting with said flanges to form air ducts having inlets outside the drum and discharge ends opening into said chamber about said feed, a fire pot seated upon the burner ring and a baflle member arranged axially above said fuel feed and including radial arms having a supporting engagement upon said fire pot.

2. A burner plate embodying therein a flat circular bottom wall having a centrally disposed raised portion having a central opening and an annular groove in the top surface thereof, there being a second annular groove about the base of said raised portion, a plurality of sets of radial upright flanges extending from a point near said last mentioned groove to a point beyond the periphery of said bottom wall with the flanges of one set connected at their inner end to those of adjacent sets to partially surround said last mentioned groove, there also being a hole in said the burner plate, all opening at one end about said raised portion and all opening at the other end outside of the drum, a burner ring positioned in axial alignment with and above said raised portion, a firepot engaged upon said ring and a baffie supported from the firepot in spaced relation above and in axial alignment with said burner ring and fuel spreading member respectively.

ADOLPH R. HQEFT. 

